Boiler



(No Model.)

G. E. MARSTON.

BOILER.

Patented Jan i Q I d C E me annals areasp-n., Mofo-urna., wAsNlmTou, o. c.

A llNtTED STATES PATENT OFFICE..

CHARLES E. MARSTON, OF DOVER, NEW' HAMPSHIRE.

BOILER.

SPECIFICATION forming part ofLetters Patent No. 445,473, dated January 27, 1891.

Application filed March l, 1890, Serial No. 342,240. (No model.)

To a/ZZ whom t may concern,.-

Be it known that I, CHARLES E. MARs'roN, of Dover, in the county of Stratford and State of New Hampshire, have invented a new and Improved Boiler, of which the following is a.

full, clear, and exact description.

l The object ofthe invention is to provide a new and improved boiler, which is simple and durable in construction, takes up very little room, presents a great heating-surface, and permits of generating steam very rapidly.

The invention consists of a series of tubes each connected with the water-supply and steam-dome and provided with a branch pipe extending from the said tube and opening into it near the top and bottom.

The invention also consists iu certain parts and details and combinations of the same, as will be described hereinafter, and then pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure l is a sectional side elevation ofthe improvement on the line l l of Fig. 2. Fig. 2 is a sectional plan view of the same on the line 2 2 ot Fig. Land Fig. 3 isa side elevation of one of the tubes.

The improved boiler A is provided with a hollow ring-shaped base B, connected with the water-supply pipe C for filling the boiler with water. Inside of the ring-shaped base B may be arranged the ire-pot for heating the boiler in the usual manner. From the top of the base B extends upward a series of pipes D, connected with vertically-arranged tubes E, set in a circle and having their outer sides curved, so that the several tubes form a wall or shell for a combustion-chamben One or two tubes E are lett out to form an opening for a feed-door. The tubes may also be arranged in other l'orms than a ci-rcle. Theinwardly-extcnding sides of each tube are inclined toward each other, as is plainly shown in Fig. 2, so that the sides ot the several tubes do not touch and the heat is permitted to readily pass onto the said sides.

From the upper end of each tubeE extends a tube F, opening into and supporting the steam-dome G, having a dished bottom G and an inverted dished top G2, from which leads the steam-pipe ll for carrying off the steam. The pipes F extend into the steam-dome G to about the horizontal plane, passing through the joint of the bottom and top G and G2, respectively, so that water can collect in the dished bottom Gand remain there to protect said bottom G' from the heat of the lire-box.

Each ofthe tubcsE is providedwithabranch 6o pipe I, which extends from near the bottom of the tube inward and curves back again to enter the tube at or near its top above the water-line, as is plainly shown in Fig. l. This branch pipe is preferably ot wrought-iron, its ends being cast into the side of the tube E, and it is also provided with series of outside annular langes, as is plainly shown in Eig. 3. Annular anges are also formed on the inner sides of the tube E.

In the center of the bottom G of the steamdome G is secured a short pipe J, the upper end of which is iu line with the upper ends of the pipes F, while the lower end connects with the downWardly-extending pipe K, opening into a chamber L, from which extends downward a series of pipes N, opening into a second chamber O, connected by a pipe l) with the feed-pipe C. The pipes N are also provided with annular flanges.

The operation is as follows: The water, passing through the supply-pipe O, fills the base B, the pipes D, and extends into the tubes E and the branch pipes I to about the height shown in Fig. l. 'lhe Water also passes from 8 5 the feed-pipe C to the pipe P, to the chamber O, and extends in the pipes N to the same level as in the tubes E andthe pipes l. NOW when heat is generated in the base B the water in the several parts is rapidly heated and 9o steam is generated, which steam passes through the pipes E, K, and J to the steamdome G and is taken from the latter by the pipe H to the apparatus or machine for utilizing its power. The water of condensation in the steam-dome G accumulates in the dished bottom G', so that the latter is constantly covered with Water, which protects the said bottom from the heat of the lire-box, and surplus water in the said steam-dome can pass 10o readily through the pipes F into the tubes E, and through the center-pipe J, through the pipe K, and the chamber L to the pipes N. The heat passing up in the center ofthe boiler heats the branch pipes I to a higher degree than the tubes E, s0 that the Water in the said branch pipes I' boils up through their upper ends and passes into the tops of the tubes E, so that a' complete circulation of the water takes place in each ot the tubes by means of the branch pipe I. It will be seen that the water in boiling' over the upper end ot' the branch pipes I into t-he upper ends of the tubes E readily separates from the steam, which latter passes up to the dome G by the pipe F, while the water by its own Weight falls down the tubes E until it strikes the water therein. It will further be seen that the steam in passing up to the dome G is partly superheated'in the pipes F, the compartment L, and the pipe K, so that the steam in the dome G is in a very dry state. It will further be seen that the branch pipes I project into the interior space or combustion-chamber formed by the series of tubes E, and thus a large heating-surface is obtained, which, in connection with the large heating-surface of the pipes N, the chambers O and L, as Well as of the tubes E, permits of generating steam very quickly.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

-l. In a steam-boiler. the combination, with a dome having a dish-shaped bottom and a hollow base, of a series olf vertical tubes arranged to form a combustion-chamber, with three sides of each tube presented to the combustion -chamber, and tubes provided with inwardly-curved branch pipes, the top end of said pipes to discharge back into the vertical tubes above the water-line in said tubes, and short pipes connecting the tubes with the dome, projecting into the dome and above the bottom thereof, substantially as shown and described.

2. In a boiler, the combination, with adome having a dish-shaped bottom, of a chamber below the dome, a pipe connecting the chamber and dome, said pipe projecting into the dome above the bottom thereof, a second chamber below the first-named chamber and communicating with the water-supply,and vertical pipes connecting the two chambers, substantially as described.

3. Ina boiler, the combination of a dome having a dish-shaped bottom, a ring-shaped base, vertical tubes communicating with the base and dome and provided with inwardly curved branch pipes, a chamber below the dome and communicating therewith, a Second chamber communicating with the Waterlsupply, and vertical tubes connecting the two chambers, substantially as herein shown and described.

4. In a steam-boiler, the combination of a dome having a dish-shaped bottom, vertical tubes provided with curved branch pipes and arranged to form a combustion-chamber, a series of pipes leading from the tubes into the dome, with their ends projecting above the bottom thereof, a chamber below the dome and provided with an upwardly-extending pipe, a short pipe secured to the center of the bottom of the steam-dome and in communication withthe pipe of the 'said CHARLES E. MARsroN.

Witnesses:

RoscoE G. BLANCHARD, ROBERT G. PIKE. 

